<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>后代选择器</title>
		<style>
			div #tb{
				
			}
			div a{
				color: red;
				font-size: 50px;
			}
		</style>
	</head>
	<body>
		<div>
			<p>
				<a id="tb" href="#">淘宝</a> 
			</p>
			<a id="ya" href="#">亚马逊</a>
		</div>
		<a href="#">百度</a>
	</body>
</html>